<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html
        PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <title>Title</title>
</head>
<body>
<form action="bmi">
    身高 <input type="text"placeholder="请输入你的身高">Kg <br>
    体重 <input type="text"placeholder="请输入你的体重">m
</form>
</body>
</html>